People buy what is advertised to them, let's be real. Yes, Samsung offers such devices, and I for example have an Active Tab 3 as my daily driver (despite its issues, such as the screen being glued to the case, and the glue is not water-tight when it gets even remotely warm).
But most people are going to buy what their telco offers on sale, and that is iPhones and Samsung Galaxy S series. Everything else is specialty that you need to buy in cash.